KV331 Audio was founded in 2012 by a dedicated team of engineers, musicians, and sound designers with the sole purpose of providing high-quality virtual instruments for musicians globally. Its flagship soft synth, SynthMaster, has over 24,000 licensed users in over 110 countries and received numerous awards from prestigious music technology publications around the world; while walking away from MusicTech Magazine's 2016 Gear Of The Year awards as a Gold Award Winner in the 'Best Software Instrument/Sample Library' category, MusicRadar readers recently ranked it number one in their '50 best VST/AU plugin synths in the world today' survey.

KV331 Audio in the KVR Marketplace

Latest News from KV331 Audio

Latest Videos from KV331 Audio

Latest Forum Posts in the KV331 Audio forum @ KVR

MIDI on ARP Presets
by Carlo Celuque at 16 Feb 2020, 07:44
Should filters be adding so much CPU usage?
by claudedefaren at 11 Feb 2020, 18:48
SynthMaster 2.9.9
by kv331 at 10 Feb 2020, 02:06
AudioIn with Synthmaster 2
by doublenothing at 10 Feb 2020, 01:37
Synthmaster ONE V1.3 - Effects in Ableton
by Zackary at 17 Jan 2020, 02:42
Clear MIDI Mappings
by Tao Tone at 15 Jan 2020, 00:32
Synthmaster 2.9 and Synthmaster One Comparison
by suisidechain at 31 Dec 2019, 19:18
Synthmaster One DEMO crashing Logic 10.4.4
by enossified at 23 Dec 2019, 06:17
I want Synthmaster 2.9.8 to work
by kv331 at 23 Dec 2019, 03:26
How to reach our support
by Gercek_KV331 at 23 Dec 2019, 00:09
Synthmaster One Arp out of sync
by 4damind at 14 Dec 2019, 05:05
Synthmaster One Scales (Global/Preset)
by farjedi at 10 Dec 2019, 13:41
SynthMaster One: Midilearn problem
by -Neb- at 9 Dec 2019, 02:24
How important is aftertouch with Synthmaster presets?
by VELLTONE MUSIC at 9 Dec 2019, 02:00
Engine Buffer Size
by outerspacecat at 6 Dec 2019, 11:47
SynthMaster29Player Validation Issue in Logic 9
by Gercek_KV331 at 6 Dec 2019, 00:55
SynthMaster One - Arpeggiator: Note velocity ??
by RandyEspoda at 5 Dec 2019, 21:34
Synthmaster One: public library problems
by -Neb- at 2 Dec 2019, 03:15
Why use Synthmaster for drums?
by kv331 at 1 Dec 2019, 01:21

Products by KV331 Audio

Timeline of Latest Product Changes [view all]



Discussion: Active
7 May 2016 at 2:12pm

Crappy support.

Tried to acquire a SynthMaster license second hand. Paid the seller and he contacted KV331 transfer the license. A week went by - with no response from KV331. Had to cancel the deal. The seller did what he could, but KV331 just did not respond. Never getting any of their products.


7 May 2016 at 7:05pm

Sorry that you had this issue. I've had good experiences with KV331 myself. They have a lot of sales, if you sign up for their newsletter or follow them on social media you can save money that way. Buying used software from third party sellers is kind of hit-and-miss IME. I'd be hesitant to formulate your opinions on a company based on your experiences with a third party seller.

7 May 2016 at 2:50pm

I don't think the licenses are transferable. Synthmaster is a really nice synth, never had any problems with mine.

7 May 2016 at 3:06pm

Had several questions through the years and Bulent has always been great. One of my favorite and most used VSTs.




31 May 2016 at 10:14pm

Synthmaster 2.8 Doesn't Even Load On Windows 7 x64 Ableton Live 9.6.1


Uinstalled Synthmater from Control Panel
Deleted Documents/Synthmaster
Deleted Documents/Synthmater27temp
Deleted Program files/VstPlugins/Kv331 Audio (my custom location for Synthmater 2.8)
Deleted Program Files (x86)/VstPlugins/Kv331 Audio (my custom location for Synthmater 2.8)

Fresh install.

Copied My personal License File to Documents/Synthmaster.

Emtpy project, added Synthmater 2.8 to a new MIDI track. . .

"Ableton Live"
"A serious program error has occured. Live will shut down after this message box is closed.

Please restart Live and follow the instructions in the 'Report A Crash' lesson that will appear in Live's Help View."


2.8 wasn't tested enough that's for sure. :/.

Tim Otholt.


31 May 2016 at 11:08pm

Thanks for the info. I'm just finishing up on a game OST and was about to upgrade... then thought... WAIT.....*phew*.

5 August 2017 at 5:20pm

not sure if this is where i report a bug, but in reason 9.5 I'm using synth master one, and when i open the plugin to modify an FM patch I'm making the semitones and octave changes when ever i close and reopen the plugin.

each time i close and re open the semitones are set to 11 and the pitch octaves are at -3.

8 September 2019 at 2:01am

Been trying for the last three hours to get Synthmaster 2.9 to load without continual prompts to download a license key - which I have done too many times to count. Used every link provided, uninstalled, reinstalled repeatedly. Sent numerous support tickets (knowing I'm outside of business hours). Last support ticket I tried to send landed me on a 404 - File or directory not found. Although it installed into my main VST folder, Reaper will not recognize it. Further, the KVR OSC #73 Users Bank download lands on this: File Not Found: Firefox can't find the file at http://cdn.synthmaster.com/synthmaster/usersdownloads/expansions/kvrosc73usersbank/kvrosc73usersbank.zip?st=oKtKYVAEBY71G4j5vnJ2ig&e=1567993451.

Cleared space in my arrangement specifically to use Synthmaster on a deadline project. Bought into the rave reviews - hook, line and sinker. Demos sure sound great. Yet, here I am sending support tickets to no avail and writing on a forum in desperation. Had the weekend to work on this. What a disappointment.

16 September 2019 at 9:41pm

It behaves as if you had changed the default installation directory to choose another directory... which is write protected.

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